Replace additional anonymous classes with lambda expressions

Change-Id: I3a416f2fefa93f753c71811ff448d621f960103a

src/main/java/com/googlesource/gerrit/plugins/importer/client/CompleteImportDialog.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/client/CompleteImportDialog.java b/src/main/java/com/googlesource/gerrit/plugins/importer/client/CompleteImportDialog.java
index ce1a6c1..e0339fa 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/client/CompleteImportDialog.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/client/CompleteImportDialog.java
@@ -17,8 +17,6 @@
 import com.google.gerrit.plugin.client.Plugin;
 import com.google.gerrit.plugin.client.rpc.NoContent;
 import com.google.gerrit.plugin.client.rpc.RestApi;
-import com.google.gwt.event.dom.client.ClickEvent;
-import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.gwt.user.client.ui.Button;
 import com.google.gwt.user.client.ui.DialogBox;
@@ -63,12 +61,7 @@
               p.add(new Label("The project "
                 + (copy ? "copy" : "import") + " was completed."));
               Button okButton = new Button("OK");
-              okButton.addClickHandler(new ClickHandler() {
-                @Override
-                public void onClick(ClickEvent event) {
-                  successDialog.hide();
-                }
-              });
+              okButton.addClickHandler(event -> successDialog.hide());
 
               p.add(okButton);
               successDialog.add(p);

src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportProjectScreen.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportProjectScreen.java b/src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportProjectScreen.java
index 7601de4..206f12d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportProjectScreen.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportProjectScreen.java
@@ -21,8 +21,6 @@
 import com.google.gerrit.plugin.client.Plugin;
 import com.google.gerrit.plugin.client.rpc.RestApi;
 import com.google.gerrit.plugin.client.screen.Screen;
-import com.google.gwt.event.dom.client.ClickEvent;
-import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.gwt.user.client.ui.Button;
 import com.google.gwt.user.client.ui.DialogBox;
@@ -65,12 +63,7 @@
 
     Button importButton = new Button("Import");
     importButton.addStyleName("importer-importButton");
-    importButton.addClickHandler(new ClickHandler() {
-      @Override
-      public void onClick(ClickEvent event) {
-        doImport();
-      }
-    });
+    importButton.addClickHandler(event -> doImport());
     buttons.add(importButton);
     importButton.setEnabled(false);
     new OnEditEnabler(importButton, fromTxt);
@@ -107,12 +100,7 @@
         p.add(new Label("The project was imported."));
         p.add(new Label("Created Changes: " + result.numChangesCreated()));
         Button okButton = new Button("OK");
-        okButton.addClickHandler(new ClickHandler() {
-          @Override
-          public void onClick(ClickEvent event) {
-            successDialog.hide();
-          }
-        });
+        okButton.addClickHandler(event -> successDialog.hide());
 
         p.add(okButton);
         successDialog.add(p);

src/main/java/com/googlesource/gerrit/plugins/importer/client/ResumeImportDialog.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/client/ResumeImportDialog.java b/src/main/java/com/googlesource/gerrit/plugins/importer/client/ResumeImportDialog.java
index 79cd727..b56f46d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/client/ResumeImportDialog.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/client/ResumeImportDialog.java
@@ -21,8 +21,6 @@
 
 import com.google.gerrit.plugin.client.Plugin;
 import com.google.gerrit.plugin.client.rpc.RestApi;
-import com.google.gwt.event.dom.client.ClickEvent;
-import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.gwt.user.client.ui.Button;
 import com.google.gwt.user.client.ui.CheckBox;
@@ -41,7 +39,7 @@
   private final Button resumeButton;
   private TextBox userTxt;
   private TextBox passTxt;
-  private final CheckBox forceCheckBox;
+  private CheckBox forceCheckBox;
 
   public ResumeImportDialog(final String project, final boolean copy) {
     super(/* auto hide */false, /* modal */true);
@@ -52,9 +50,7 @@
 
     resumeButton = new Button();
     resumeButton.setText("Resume");
-    resumeButton.addClickHandler(new ClickHandler() {
-      @Override
-      public void onClick(ClickEvent event) {
+    resumeButton.addClickHandler(event -> {
         hide();
 
         RestApi restApi;
@@ -86,7 +82,7 @@
                 p.add(new Label("Created Changes: " + result.numChangesCreated()));
                 p.add(new Label("Updated Changes: " + result.numChangesUpdated()));
                 Button okButton = new Button("OK");
-                okButton.addClickHandler(event1 -> successDialog.hide());
+                okButton.addClickHandler(event -> successDialog.hide());
 
                 p.add(okButton);
                 successDialog.add(p);
@@ -99,7 +95,6 @@
               public void onFailure(Throwable caught) {
               }
             });
-      }
     });
     buttons.add(resumeButton);